Science reporter Donald G. McNeil Jr. and global public health professor Devi Sridhar join Christiane Amanpour to discuss the implications of Britain giving emergency authorization to the Pfzier-BioNTech coronavirus vaccine. Then, actor Riz Ahmed and director Darius Marder talk about reaching out to the deaf community for their film, "Sound of Metal." Journalist Jonathan Alter speaks to Walter Isaacson about his latest book on America’s 39th president, Jimmy Carter.
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